package socket;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
 * 聊天室服务端
 */
public class Server {
    private ServerSocket serverSocket;
    private List<PrintWriter> allOut = new ArrayList<>();

    public Server() {
        try {
            System.out.println("正在启动服务器");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务器启动完毕");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {
        try {
            while (true) {
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接了");
                //启动一个线程处理与客户端的交互
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }

    private class ClientHandler implements Runnable {
        private Socket socket;
        private String host;

        public ClientHandler(Socket socket) {
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }

        public void run() {
            PrintWriter pw = null;
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);
                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw, true);
                synchronized (allOut) {
                    allOut.add(pw);
                }
                System.out.println(host + "上线了，当前在线人数为：" + allOut.size());
                //   String message =br.readLine();
                //   System.out.println(message);
                String message;
                while ((message = br.readLine()) != null) {
                    System.out.print(host + "说" + message);
                    synchronized (allOut) {
                        for (PrintWriter o : allOut) {
                            o.println(host + "说" + message);
                        }
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                // 处理客户端断开后的操作
                try {
                    socket.close();
                    synchronized (allOut) {
                        allOut.remove(pw);
                    } //将当前客户端输出流从共享集合中删除
                    System.out.println("下线了，当前在线人数为：" + allOut.size());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

